package com.sky.service.impl;


import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品和对应的口味
     */
    @Transactional//事务管理
    public void saveWithFlavor(DishDTO dishDTO){

        Dish dish= new Dish();
        //把源对象source的属性值赋给目标对象target中与源对象source的中有着同属性名的属性
        BeanUtils.copyProperties(dishDTO,dish);//将dishDTO中的属性复制到dish中

        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        long dishId=dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors=dishDTO.getFlavors();//获取口味列表

        if (flavors!=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);//设置菜品id
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());//返回分页结果
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        log.info("批量删除菜品：{}",ids);
        //判断当前菜品是否能够删除--是否存在起售中的菜品
        for(Long id:ids){//遍历菜品id
            Dish dish=dishMapper.getById(id);//根据id查询菜品
            if(dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除--是否存在关联的套餐
        List<Long> setmealIds=setmealDishMapper.getSetmealIdsByDishIds(ids);
        //setmealIds != null确保了setmealIds是一个有效的List对象，setmealIds.size() > 0确保了这个列表中至少有一个元素
        if(setmealIds!=null&&setmealIds.size()>0){
            //当前菜品存在关联的套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        /*for(Long id:ids){
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish=dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到VO
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品和对应的口味
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if (flavors!=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());//设置菜品id
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 修改菜品状态
     * @param status
     * @param id
     */
    @Transactional	//涉及修改的操作加入事务管理比较好
    public void startOrStop(Integer status, Long id) {
        Dish dish = dishMapper.getById(id);//获取菜品对象
        dish.setStatus(status);//设置菜品状态
        dishMapper.update(dish);//更新菜品信息

        //如果是停售操作, 则需要将菜品关联的套餐一并停售
        if (status.equals(StatusConstant.DISABLE)) {
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);

            //根据菜品id查询关联的所有套餐id
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);

            if (setmealIds != null && setmealIds.size() > 0) {
                setmealIds.forEach(setmealId -> {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);  //根据套餐id修改套餐信息
                });
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
